Electrostatics Multiple Choice Questions and Answers - ObjectiveBooks

Electrostatics Multiple Choice Questions and Answers

Practice Test: Question Set - 12

1. Mica capacitors are characterized by all of the following except
    (A) Stable operation
    (B) Accurate value
    (C) Low leakage reactance
    (D) Low losses

2. Dielectric strength ________ with increasing thickness
    (A) Increases
    (B) Decreases
    (C) Remains unaltered
    (D) None of the above

3. Electric displacement is a _________quantity.
    (A) Scalar
    (B) Vector
    (C) Both of the above
    (D) None of the above

4. The power dissipated in a pure capacitor is
    (A) Zero
    (B) Proportional to applied voltage
    (C) Proportional to value of capacitance
    (D) Both (B) and (C) above

5. A dielectric material must be
    (A) Resistor
    (B) Insulator
    (C) Good conductor
    (D) Semi conductor

6. If three 15 uF capacitors are connected in series, the net capacitance is
    (A) 5 uF
    (B) 30 uF
    (C) 45 uF
    (D) 50 uF

7. Paper condenser is
    (A) Always polarized
    (B) Usually of fixed value
    (C) Electrolytic condenser
    (D) A variable condenser

8. The minimum value of potential gradient in a cable occurs in
    (A) Insulation
    (B) Conductor
    (C) Outer sheath
    (D) Uniformly all over

9. If three 10 uF capacitors are connected in parallel, the net capacitance is
    (A) 20 uF
    (B) 30 uF
    (C) 40 uF
    (D) 50 uF

10. The dissipation factor of a good dielectric is of the order of
    (A) 0.0002
    (B) 0.002
    (C) 0.02
    (D) 0.2

11. In a capacitor the electric charge is stored in
    (A) Metal plates
    (B) Dielectric
    (C) Both (A) and (B)
    (D) None of the above

12. Which of the following capacitors will have the least value of breakdown voltage?
    (A) Mica
    (B) Paper
    (C) Ceramic
    (D) Electrolytic

13. Paper capacitors usually have a tolerance of
    (A) ± 5 %
    (B) ± 10 %
    (C) ± 15 %
    (D) ± 20 %

14. Dielectric strength of mica is
    (A) 10 to 20 kV/mm
    (B) 30 to 50 kV/mm
    (C) 50 to 200 kV/mm
    (D) 300 to 500 kV/mm

15. The unit of dielectric strength is given by
    (A) V/m
    (B) V2/m
    (C) m/V
    (D) m/V2

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